Re: Recent Gaobot event

[Gary Dobbins <dobbins () ND EDU>]

If anyone would like the SNORT sig we're using to sense 'bots phoning home
for control instructions, just drop me a line.  Am not sure posting it here
would be wise - too many lurkers who might like to subtly alter this
overused variant to counter the sig.

When this triggers an alert on your SNORT, the bot is just waking up and
still benign (relatively speaking) and can be removed before the 'owner'
wakes them up and uses them to do harm.


H. Morrow Long wrote:
> Gordon -- Yes, we saw this, but it was for approx. the
> two weeks prior to last week. A number of PCs
> were hit with it and they began attempting to brute
> force the passwords for (all of ?) the accounts in our
> Active Directory.
>
> We'd just implemented a domain account lockdown
> policy -- a short lockdown period -- after a somewhat
> high number of unsuccessful login attempts
> so we began to see the effects of the new lockdown
> policy kick into effect rather quickly (some users
> reported their accounts would lock out for the
> lockdown period).
>
> The infected PCs would show up in the security
> event log of other computers and the active directory
> servers with high numbers of unsuccessful login
> attempts on various accounts.
>
> - H. Morrow Long, CISSP, CISM
> University Information Security Officer
> Director -- Information Security Office
> Yale University, ITS
>
>
> On Dec 16, 2004, at 7:26 AM, Gordon D. Wishon wrote:
>
>     Is anyone else seeing any evidence of this on their campus?  Like
>     Boston College, we've been hit with this within the past two weeks,
>     and at one point the traffic generated by machines attempting to
>     phone home seriously affected our network performance.
>
>
>
>     Virus Steals Student Passwords: Boston College's campus network was
>     hit by a virus that forced computers to guess at passwords that
>     would provide access to other linked machines.
>     /The Heights/
>
>
>     Curiously, we've found little discussion of this elsewhere.
>
>     Gordon
>
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--

  ------------------------------------------------------------
  Gary Dobbins, CISSP -- Director, Information Security
  University of Notre Dame, Office of Information Technologies

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